United States Geological Survey
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Document Type
Article
Date of this Version
March 2003
Abstract
In 2001, the U.S. Geological Survey’s (USGS) National Water- Quality Assessment (NAWQA) Program began its second decade of intensive water-quality assessments (Cycle II). NAWQA scientists plan to revisit 42 major river-basin and aquifer systems (called study units) that were assessed in the first decade (Gilliom and others, 2001).
Comments
USGS Fact Sheet 013–03.
March 2003.